Rotary pump.



No. 721,207. PATENTED FEB. 24, A1,903.

J. B. C. LooKWoOD. ROTARY PUMP.

APrLIoA'rIoN FILED AUG. 25. 1902.

No MODEL.

2 SHEETSQSHEBT 1.

"MIU

W/TNESSES.' v -NVENTOH v .f (Zac/wauw .l M 5y ATTORNEY J. B. '0.LOGKWOOD.

ROTARY PUMP.

APPLICATION FILED AUG. 25, 1902.

' H0 IODEL.

A nohwfr PATENTED FEB. 24, 1903.

2 SHEETS-SHEET '2.

UNITEDa STATES PATENT OEEICE.

JAMES B. C. LOCKWOOD, OF SEATTLE, WASHINGTON.

ROTARY' PUMP.

SPECIFICATION forming part of Letters Patent No. 721,207, dated February24, 1903.

i Application tiled August 25,1902. Serial No. 120,874. (No model.)

To all whom t may concern:

j Beit known that I, J AMES B. C. Locxwoon, a citizen of the UnitedStates, residing at Seattle, inthe county of King and State ofWashington, have invented certain new and useful Improvements in RotaryPumps, of which the following is a speciication, reference be-v ing hadtherein to the ings.

This invention relates to improvements in rotary pumps, having specialreference to that class of pump used for hydraulic dredging, whereinlarge quantities of water carrying rock, sand, and other grittysubstances have to be handled.

The object of the invention is to prevent Wear of the main casing ofpump and to facilitate repairs, thereby making frequent renewals ofpumps unnecessary, also maintaining approximately a maximum efficiency.

To these ends my invention consists in certain novel features ofconstruction and combination of parts, which will be hereinafterdescribed and claimed. A

In the accompanying drawings, Where similar gures of reference indicatecorresponding parts in the three views, Figure 1 is a verticaltransverse section of pump embodying my improvements, taken on line wofFig. 2. Fig. 2 is a vertical longitudinal section of same on line y yof Fig. 1. Fig. 3 isa front elevation of a portion of runner 13. A

The driving-shaft 2 is so mounted in journal-bearings (not shown indrawings) as to be concentric of the containing-case 4, whichcontaining-case has a central induction-opening 5 and a tangentialorifice 6. lt is preferable to make both heads or covers 7 and 8detachable of the case for convenience of access. The case 4 is securedagainst distortion by the annular groove and corresponding tongue 11 andis packed by rubber gaskets fitting into annular grooves 10.

The pump-runner 13 is provided with two peripheral plate-rims 14, whichform shrouds for a plurality of curved blades 15 16, securedtherebetween, the alternate ones 15 continuing to the runner-hub 17 andare preferably made integral therewith, as are also the stiffening-ribs18.

Secured to the external surface of each rim-plate are vanes19,'positioned opposite to accompanying drawand of the same curvature,preferably, as the adjacent aforesaid shrouded blades or portionsthereof. These vanes extend from the outer edge of peripheral plate-rimsto rings 20 and 21, secured, respectively, in proximity to the inneredge of said rims and to liners attached to covers. As the runnerrotates the vanes centrifugally expel any sand or other gritty substancewhich has a tendency to collect between the runner-shrouds and thecovers. The said rings 2O and 21' are to prevent, so far as practicable,the passage of Water and grit into the space occupied by the vanes 19;also, together with the said vanes to prevent any tendency to backflowor local circulation. In the event of the said rings becoming slightlyworn the passage therebetween' would not materially interfere with thepumps efficiency, as the leakage thereat would be from the axisoutwardly on account of the flow created by the revolving vanes.

The coverS is made With a concentric shoulder 23 for-the purpose ofoffsetting of spreading the cover-liner 22 and the adjacent shroud,

so'that the inner face of the latter will be in the same plane with thedisk-liner 24 of head 8.

The opposite head 7 is protected from Wear by a lining-piece 24', as isalso the inner peripheral surface of the case by liner 25, which withthe outer cover-liners 22 24' project into the discharge-orificeLining-pieces 2G, preferably made in two parts, as shown in Fig. 2, areprovided for the induction-opening 5 to protect the same from wear. Theinner part of the last-named liner extends in a curve interiorly of thepump to be iiush or even With the inner face of the adjacent shroud ofrunner, while the other part is inserted from the outside and overlapsthe rst one. All of the aforementioned lining-pieces are so disposed asto provide-unobstructed lead and discharge Ways for the conveyedmaterial andare detachably secured to the various parts of the case forwhich fitted by suitable bolts with inner countersunk heads andscrew-nuts external of the shell, which are so arranged that they may bereadily gotten at'when it is desired to replace an individuall piece.

The operation and advantages of the invention will be apparent from theforegoing dcscription; but it may be mentioned that the IOO combinationof the runner-shrouds whereby the axial thrust is overcome, togetherwith other features of construction hereinbefore referred t0, providesadredging-pump far in advance of any other which has come to my notice.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The herein-described pump, comprising a case having acentralrinduction and a tangential discharge-opening; an annularshoulder upon the end opposite said inductionopening; a runnerconcentric of said case and provided with tangentially-disposed curvedblades; a shroud upon each of the opposite longitudinal ends of saidblades; a ring secured to the external surface of each shroud inproximity to its inner periphery; curved vanes extending from said ringsto the outer periphery of said sh'rouds; liners covering the entireinner surfaces of said casing,said liners comprising a peripheralcasing-lining, a disklining upon surface opposite said inductionopening;a two-part liner for said opening, the inner part of saidinduction-lining and corresponding surface of said disk-lining beingrespectively even with inner surfaces of adjacent said runner-shrouds, aconcentric liner upon each of said casing-covers and severally providedwith a ring adjacent to their inner peripheries and contiguous with saidrings of the shrouds; and the last-named rings, substantially as and forthe purposes set forth.

2. The combination with a case having a central induction and atangential dischargeopening, a liner in said induction-openingprojecting interiorly beyond the surface of that end, and a liner uponthe opposite end projecting inwardly from said end; of a runner havingcurved blades and shrouds upon the opposite longitudinal ends of saidblades so that the inner surfaces of said shrouds will be in the sameplane respectively with the inner end of the induction-liner and thesaid end liner, substantially as described.

3. The combination in a pump having central induction and tangentialdischarge openings, a shrouded runner mounted on a driving-shaftconcentric of the pump-case, of an annular shoulder on one of the coversof said case whereby the shroud of said runner projects longitudinallybeyond the central p0rtion of the said cover or a liner attached thereto, substantially as set forth.

4. In combination with a pump having a central induction-opening and atangential discharge-opening, a blade-shrouded runner concentric of thepump-case, of liner for said induction-opening made in two overlappingparts respectively adapted to be inserted from the opposite sides of thecasing-cover, the inner end of the said lining being in the same planewith the inner surface of the adjacent runner-shroud, substantially asset forth.

5. The combination with the pump-casing provided with a concentricrunner having curved blades, shrouds on longitudinal ends of saidblades, and liners upon the interior surfaces of said casing, of a pairof contiguous rings adjacent to the inner periphery of said shrouds, oneof each pair of rings being secured to the adjacent shroud and the otherto the said liners, substantially as described.

In testimony whereof I afx my signature in presence oftwo witnesses.

JAMES B. C. LOCKWOOD.

Witnesses:

ALBERTE. GEBHARDT, THOMAS C. TURLAY.

